Professional stereo microscope on articulating arm has long working distance to enable users to perform work or manipulate large items, including circuit boards and dental appliances Trinocular viewing head with interchangeable pairs of 10x and 20x super-widefield eyepieces, adjustable interpupillary distance, fixed 45-degree vertical inclination to reduce eye and neck strain, and 360-degree rotation capability to enable sharing 0.7x-4.5x zoom objective provides continuous zoom magnification and longer focal length for inspecting large-scale specimens, a 0.5x Barlow lens extends the working distance, and a 2.0x Barlow lens extends the magnification range Removable rheostat-controlled 144-bulb LED ring light provides intensity control and bright, cool light for working with temperature-sensitive or live specimens Pillar-type articulating arm stand has 40" reach, and a clamp for attaching to table or desk